fun handleSuccess(): RealConnection

    fun cancel()

    /**
     * Returns a plan to attempt if canceling this plan was a mistake! The returned plan is not
     * canceled, even if this plan is canceled.
     */
    fun retry(): Plan?
  }

  /**
   * What to do once a plan has executed.
   *
   * If [nextPlan] is not-null, another attempt should be made by following it. If [throwable] is

				return
			}
		case "fl":
			z.Failed, err = dc.ReadBool()
			if err != nil {
				err = msgp.WrapError(err, "Failed")
				return
			}
		case "cnl":
			z.Canceled, err = dc.ReadBool()
			if err != nil {
				err = msgp.WrapError(err, "Canceled")
				return
			}
		case "bkts":
			var zb0002 uint32
			zb0002, err = dc.ReadArrayHeader()
			if err != nil {
				err = msgp.WrapError(err, "QueuedBuckets")
				return

		},
	)

	ctx, cancel := context.WithCancel(context.Background())
	cancel() // cancel context to test.

	_, err := cache.GetWithCtx(ctx)
	if !errors.Is(err, context.Canceled) {
		t.Fatalf("expected context.Canceled err, got %v", err)
	}

	ctx, cancel = context.WithCancel(context.Background())
	defer cancel()

	t1, err := cache.GetWithCtx(ctx)
	if err != nil {
		t.Fatalf("expected nil err, got %v", err)

Calls can be canceled from any thread. This will fail the call if it hasn’t yet completed! Code that is writing the request body or reading the response body will suffer an `IOException` when its call is canceled.

## Dispatch

  override fun find(): RealConnection {
    var firstException: IOException? = null
    try {
      while (tcpConnectsInFlight.isNotEmpty() || routePlanner.hasNext()) {
        if (routePlanner.isCanceled()) throw IOException("Canceled")

        // Launch a new connection if we're ready to.
        val now = taskRunner.backend.nanoTime()
        var awaitTimeoutNanos = nextTcpConnectAtNanos - now
        var connectResult: ConnectResult? = null

		Timeout:       timeout.Timeout(),
		RetryInterval: timeout.RetryInterval(),
	}) {
		timeout.LogFailure()
		defer cancel()
		if err := newCtx.Err(); err == context.Canceled {
			return LockContext{ctx: ctx, cancel: func() {}}, err
		}
		return LockContext{ctx: ctx, cancel: func() {}}, OperationTimedOut{}
	}
	timeout.LogSuccess(UTCNow().Sub(start))

name: Linters and Tests

on:
  pull_request:
    branches:
      - master

# This ensures that previous jobs for the PR are canceled when the PR is
# updated.
concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  build:
    name: Go ${{ matrix.go-version }} on ${{ matrix.os }}
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:

}

// customErrHandler is originally implemented to avoid having the following error
//
//	`http: proxy error: context canceled` printed by Golang
func (f *Forwarder) customErrHandler(w http.ResponseWriter, r *http.Request, err error) {
	if f.Logger != nil && err != context.Canceled {
		f.Logger(err)
	}
	w.WriteHeader(http.StatusBadGateway)
}

func (f *Forwarder) getURLFromRequest(req *http.Request) *url.URL {

			default:
				sendReq = false
			}
		}
		cancel()
		<-serverCanceled
		t.Log("server cancel time:", time.Since(start))
		clientEnd := <-clientCanceled
		if !errors.Is(err, context.Canceled) {
			t.Error("expected context.Canceled, got", err)
		}
		t.Log("client after", time.Since(clientEnd))
	}
	// local to remote, unbuffered
	t.Run("unbuffered", func(t *testing.T) {
		testHandler(t, handlerTest, false)
	})

 *
 * While [onReset] may occur at any time, the following callbacks are expected in order,
 * correlated by stream ID.
 *
 *  * [onRequest]
 *  * [onHeaders] (unless canceled)
 *  * [onData] (optional sequence of data frames)
 *
 * As a stream ID is scoped to a single HTTP/2 connection, implementations which target multiple
 * connections should expect repetition of stream IDs.
 *